FIELD WORK NO 9 surveying

# FIELD WORK NO 9 surveying - 17 DETERMINATION OF RECTILINEAR...

• Lab Report
• 18

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17 [ DETERMINATION OF RECTILINEAR AREA BY RADIAL TRANSVERSING ] FIELD WORK NO. 9 Determination of Rectilinear Area By Radial Transversing. OBJECTIVES: 1. To acquire the knowledge in getting the rectilinear area by radial transversing using the theodolite. 2. To develop the technical know-how to use theodolite. 3. To apply the value of teamwork to simplify the organization of the jobs/role. 4. To improve analysis of finding the area of a irregular polygon. 5. To to apply the value of excellence and patience in measuring the height of the building . REASERCH Using the Theodolite In Surveying 2 we use a theodolite to determine (read) both horizontal and vertical angles to an accuracy of 20" and mark out the buildings on College ground using theodolite and tape (Module requirements) A theodolite is an instrument for measuring both horizontal and vertical angles. It consists of a telescope mounted movably within two perpendicular axes, the horizontal and vertical axis. All students have to use the Sokkia instrument. as that is the only one in our department. Using the same instrument students can learn from each other how to read scales and use all the feature of the theodolite. The left instrument in the opposit figure shows a Wild Theodolite

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17 [ DETERMINATION OF RECTILINEAR AREA BY RADIAL TRANSVERSING ] and the right instrument shows a Sokkia Theodolite. All features of the Sokkia Theodolite are described below: The axes and circles of a theodolite
17 [ DETERMINATION OF RECTILINEAR AREA BY RADIAL TRANSVERSING ] A theodolite can measure angles in both the horizontal and vertical planes. How accurately this can be will depend partly on the quality of the instrument, and partly on the competence of the student. A theodolite may not be in perfect adjustment and the lines and planes should be checked. To minimise error as much as possible, an angle is measured a number of times with instrument: face left (vertical circle on the left of the telescope) and face right (vertical circle on the right of the telescope). Reading an angle face right and face left will eliminate the errors due to the non adjustment of the line of collimation and the trunnion axis. We won't do any adjustment and assume the instrument is calibrated. Both axes of a theodolite are equipped with graduated circles that can be read out through microscopes. The vertical circle (the one associated with the horizontal axis!) should read 90° when the sight axis is horizontal.

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17 [ DETERMINATION OF RECTILINEAR AREA BY RADIAL TRANSVERSING ] A theodolite, like the Level is mounted on a tripod by means of a forced centering plate or tribrach, containing three thumbscrews for rapid levelling. Before use, a theodolite must be placed precisely and vertically over the point to be measured.
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• Fall '13
• rectilinear area, RADIAL TRANSVERSING, theodolite

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